| 摘要 |
<p>A microwave heating apparatus comprises a heating chamber, a microwave generator and heating resistors selectively connected through first and second switches to a power supply, and a control circuit connected through the first switch to the power supply. The heating apparatus also comprises heating resistor coupling units each including a displaceable member and a third switch. The displaceable member is displaced when the heater end is inserted to a predetermined position in the coupling unit, and the third switch is closed when the displaceable member is displaced. The third switch is connected in series between the first switch and the control circuit. The high frequency radio wave generator or the heater is thus not connected to the power supply unless the heater end is completely connected to the heater coupling unit. Accordingly, it can prevent external leakage of microwaves, insulation breakdown or other related incidents.</p> |
